The trail you have stepped onto leads to many places, And I do not believe there is an area to turn around. Myself I would not try used lawnmower blades as they may have cracks from use. However you have new. There is a section on here that deals with common found steels and I think it mentions lawn mower blades. In any case give the heat treat posted earlier a shot and If they lact like I think they will you have enough material for several blades, and They will come out nice as you make them. Bp # 0087 is about heat treating high carbon steels and is a solid reference. I keep a printed copy near by. Have fun...
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